Pre- and post-operative MRI study of an aneurysm of the right brachiocephalic artery with tracheal compression

1993 ◽  
Vol 152 (5) ◽  
pp. 457-457 ◽  
Author(s):  
A. Livolsi ◽  
L. Donato ◽  
P. Germain ◽  
B. Kastler ◽  
M. Bintner ◽  
...  
Keyword(s):  
Brachiocephalic Artery ◽  
Tracheal Compression ◽  
The Right ◽  
Mri Study

scholarly journals Neural alignment predicts learning outcomes in students taking an introduction to computer science course

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Meir Meshulam ◽  
Liat Hasenfratz ◽  
Hanna Hillman ◽  
Yun-Fei Liu ◽  
Mai Nguyen ◽  
...  
Keyword(s):  
Computer Science ◽  
Learning Outcomes ◽  
Brain Activity ◽  
Activity Patterns ◽  
Real Life ◽  
Final Exam ◽  
Neural Representations ◽  
Real Life Setting ◽  
The Right ◽  
Mri Study

AbstractDespite major advances in measuring human brain activity during and after educational experiences, it is unclear how learners internalize new content, especially in real-life and online settings. In this work, we introduce a neural approach to predicting and assessing learning outcomes in a real-life setting. Our approach hinges on the idea that successful learning involves forming the right set of neural representations, which are captured in canonical activity patterns shared across individuals. Specifically, we hypothesized that learning is mirrored in neural alignment: the degree to which an individual learner’s neural representations match those of experts, as well as those of other learners. We tested this hypothesis in a longitudinal functional MRI study that regularly scanned college students enrolled in an introduction to computer science course. We additionally scanned graduate student experts in computer science. We show that alignment among students successfully predicts overall performance in a final exam. Furthermore, within individual students, we find better learning outcomes for concepts that evoke better alignment with experts and with other students, revealing neural patterns associated with specific learned concepts in individuals.

scholarly journals Levator palpabrae superioris myositis as an unusual cause of unilateral ptosis—case report

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
Ahmed M. Abdrabou
Keyword(s):  
Previous History ◽  
Good Prognosis ◽  
Oculomotor Nerve Palsy ◽  
Ophthalmological Examination ◽  
Bilateral Ptosis ◽  
Mri Findings ◽  
Upper Eyelid ◽  
Unilateral Disease ◽  
The Right ◽  
Mri Study

Abstract Background Ptosis can be a manifestation of a more serious situation. Hence, the analysis of the complaint and the search for etiology are crucial in such cases. Ptosis has many causes; some of them lead to unilateral ptosis while others cause bilateral ptosis. For instance, myasthenia gravis is a cause of bilateral ptosis while oculomotor nerve palsy induces unilateral disease. Proper evaluation of the patient and identification of the cause are important to achieve accurate management and good prognosis. Case presentation A 47-year-old male patient attended the ER complaining of dropping the right eye lid of 2 days’ duration. There was no associated pain or diplopia. On examination, the extraocular muscles’ (EOM) motility was intact, normal pupil and corneal reflexes, and there was swelling of the upper eyelid. Ophthalmological examination revealed normal anterior and posterior chambers as well as the vitreous and retina. The patient had a previous history of traumatic intracranial hemorrhage that was resolved without surgical intervention. He also had diabetes mellitus and hypertension. The patient was transferred to the MRI unit to perform MRI study of the brain and orbit with MRA and IV contrast administration. MRI findings confirmed the diagnosis of LPS myositis, and the patient received medical treatment and improved. Conclusion Proper radiological diagnosis leads to accurate management and achieves rapid recovery and optimal patient care.

scholarly journals Altered Long- and Short-Range Functional Connectivity in Patients with Betel Quid Dependence: A Resting-State Functional MRI Study

2016 ◽  
Vol 40 (6) ◽  
pp. 1626-1636 ◽  
Author(s):  
Tao Liu ◽  
Jianjun Li ◽  
Zhiqiang Zhang ◽  
Qiang Xu ◽  
Guangming Lu ◽  
...  
Keyword(s):  
Functional Connectivity ◽  
Long Range ◽  
Short Range ◽  
Anterior Cingulate ◽  
Betel Quid ◽  
Posterior Lobe ◽  
Functional Connectivity Density ◽  
Dorsolateral Prefrontal ◽  
The Right ◽  
Mri Study

Objective: Addiction is a chronic relapsing brain disease. Brain structural abnormalities may constitute an abnormal neural network that underlies the risk of drug dependence. We hypothesized that individuals with Betel Quid Dependence (BQD) have functional connectivity alterations that can be described by long- and short-range functional connectivity density(FCD) maps. Methods: We tested this hypothesis using functional magnetic resonance imaging (fMRI) data from subjects of the Han ethnic group in Hainan, China. Here, we examined BQD individuals (n = 33) and age-, sex-, and education-matched healthy controls (HCs) (n = 32) in a rs-fMRI study to observe FCD alterations associated with the severity of BQD. Results: Compared with HCs, long-range FCD was decreased in the right anterior cingulate cortex (ACC) and increased in the left cerebellum posterior lobe (CPL) and bilateral inferior parietal lobule (IPL) in the BQD group. Short-range FCD was reduced in the right ACC and left dorsolateral prefrontal cortex (dlPFC), and increased in the left CPL. The short-range FCD alteration in the right ACC displayed a negative correlation with the Betel Quid Dependence Scale (BQDS) (r=-0.432, P=0.012), and the long-range FCD alteration of left IPL showed a positive correlation with the duration of BQD(r=0.519, P=0.002) in BQD individuals. Conclusions: fMRI revealed differences in long- and short- range FCD in BQD individuals, and these alterations might be due to BQ chewing, BQ dependency, or risk factors for developing BQD.

Spontaneous resolution of invasive cerebral aspergillosis following partial resection in a medically untreated infant

2012 ◽  
Vol 10 (1) ◽  
pp. 71-74 ◽  
Author(s):  
Sumit Thakar ◽  
Yasha T. Chickabasaviah ◽  
Alangar S. Hegde
Keyword(s):  
Emergency Services ◽  
Mass Effect ◽  
Cerebral Hemiatrophy ◽  
Right Cerebral Hemisphere ◽  
History Of ◽  
Subcortical Regions ◽  
The Right ◽  
Mri Study ◽  
The Brain

Invasive craniocerebral aspergillosis, often encountered in an immunocompromised setting, is almost uniformly fatal despite radical surgical and medical management, and is frequently a necropsy finding. The authors report a unique, self-resolving clinical course of this aggressive infection in a 10-month-old infant. The infant was brought to the emergency services in altered sensorium with a 1-week history of left-sided hemiparesis, excessive irritability, and vomiting. An MRI study of the brain revealed multiple, heterogeneously enhancing lesions in the right cerebral hemisphere with mass effect. The largest lesion in the frontotemporal cortical and subcortical regions was decompressed on an emergent basis. Histopathological findings were suggestive of invasive aspergillosis, although there was no evidence of the infection in the lungs or paranasal sinuses. Computed tomography–guided aspiration of the remaining lesions and follow-up antifungal therapy were recommended. The parents, however, requested discharge without further treatment. The child was seen at a follow-up visit 3 years later without having received any antifungal treatment. Imaging showed resolution of the infection and features of Dyke-Davidoff-Masson syndrome (cerebral hemiatrophy). This report of invasive cerebral aspergillosis resolving without medical therapy is the first of its kind. Its clinicoradiological aspects are discussed in light of previously reported cases.

Prevelance of Fabella: An MRI Study in The Eastern Anatolia Region Of Turkey

2021 ◽  
Vol 17 ◽  
Author(s):  
Huseyin Akdeniz ◽  
Sezai Ozkan ◽  
Cihan Adanas
Keyword(s):  
Femoral Condyle ◽  
Left Knee ◽  
Final Decision ◽  
Eastern Anatolia ◽  
Orthopedic Surgeons ◽  
Expert Radiologist ◽  
Number Of Patients ◽  
And Gender ◽  
The Right ◽  
Mri Study

Background: The fabella, which is generally located in the lateral head of the gastrocnemius muscle, is a sesamoid bone that articulates with the posterior face of the lateral femoral condyle. As traditional information, the prevalence of fabella is between 10–30% in the population and is usually present in both knees. Introduction: The objective of this study was to investigate the knee MRIs in the Eastern Anatolia Region of Turkey subjects in order to assess the prevalence of the fabella and analyse the differences between gender, age and laterality and its symmetry pattern. Methods: This study was a retrospective study in patients older than 18 years whose knee MRIs were taken between February 2014 and February 2016. In this study, a total of 531 patients [290 females and 241 males] were included. The radiographs were examined by two orthopedic surgeons and the fabella was located. Later, an expert radiologist made the final decision and confirmed the results. Results: The number of patients included in the study was 531. We detected os fabella in 59 (11.1%) patients. Of the 59 os fabella, 33 were in the right knee and 26 were in the left knee, 38 were female and 21were male. Conclusion: In this study, we investigated the age and gender differences besides the prevalence and the symmetry pattern of the fabella in the Eastern Anatolia Region of Turkey’s population. Prevalence of the fabella was found to be 11.1% which is different than previously published studies.

Blink-associated contralateral eccentric saccades as a rare sign of unilateral brain injury

Neurology ◽  
2016 ◽  
Vol 88 (2) ◽  
pp. 160-163 ◽  
Author(s):  
Ilaria Zivi ◽  
Eugenio Bertelli ◽  
Giacinta Bilotti ◽  
Ignazio Alessandro Clemente ◽  
Leopold Saltuari ◽  
...  
Keyword(s):  
Brain Injury ◽  
Evoked Potentials ◽  
Brain Mri ◽  
Neural Pathways ◽  
Cerebral Lesions ◽  
Infrared Video ◽  
Corrective Movement ◽  
The Right ◽  
Mri Study ◽  
Unilateral Brain

Objective:To describe a rare sign of unilateral brain injury as a form of unwanted blink-associated contralateral eccentric saccades.Methods:A 62-year-old patient who underwent an ischemic stroke affecting the entire right middle cerebral artery territory came to our attention 1 year after stroke, manifesting with transient contralateral conjugate gaze deviations associated with spontaneous blinking. We complemented the regular neurologic evaluation with brain MRI, study of evoked potentials, electroneurography of the facial nerve, and infrared video-oculoscopy.Results:The patient had left-sided hemiparesis, hypoesthesia, hemianopia, and hemispatial neglect. He also showed the occurrence of a rapid leftward conjugate deviation of the eyes, followed by a corrective movement to the primary ocular position. MRI showed a wide malacic area spanning the right frontal, temporal, and parietal cortical and subcortical regions, with signs of wallerian degeneration of the descending right corticospinal tract. Motor and somatosensory evoked potentials were centrally altered on the right side. Electroneurography of the facial nerves was normal. Infrared video-oculoscopy indicated persistence of the same blink-related saccades even in darkness.Conclusions:It is known that unilateral cerebral lesions may manifest with a contralateral conjugate gaze deviation evoked by closure of the lids. This sign, known as spasticity of conjugate gaze, may be due to the suppression of the fixation reflex. In our case, the persistence of this sign in the darkness allowed us to exclude this diagnosis. We hypothesized that the blink-related neural pathways may improperly activate the oculomotor circuitry at both the cortical and subcortical levels.

Cardiovascular-associated tracheobronchial obstruction in children

2012 ◽  
Vol 23 (2) ◽  
pp. 233-238 ◽  
Author(s):  
Shen-Hao Lai ◽  
Sui-Ling Liao ◽  
Kin-Sun Wong
Keyword(s):  
Pulmonary Artery ◽  
Airway Obstruction ◽  
Main Bronchus ◽  
Main Pulmonary Artery ◽  
Diagnostic Tools ◽  
Radiographic Findings ◽  
Tracheal Compression ◽  
Airway Obstructions ◽  
Right Pulmonary Artery ◽  
The Right

AbstractTracheobronchial compression of cardiovascular origin is an uncommon and frequently unrecognised cause of respiratory distress in children. The compression may be due to encircling vessels or dilated neighbouring cardiovascular structures. Bronchoscopy and detailed radiography, especially computed tomography and magnetic resonance imaging, are among the most powerful diagnostic tools. Few previous reports have addressed the relationship between bronchoscopic findings and underlying cardiovascular anomalies. The objective of this study was to correlate bronchoscopic and radiographic findings in children with cardiovascular-associated airway obstruction. A total of 41 patients were recruited for the study. Patients with airway obstruction were stratified on the basis of the aetiology of the cardiovascular structures and haemodynamics into an anatomy-associated group and a haemodynamics-associated group. In the anatomy-associated group, stenosis and malacia were found with comparable frequency on bronchoscopy, and the airway obstructions were mostly found in the trachea (71% of patients). In the haemodynamics-associated group, malacia was the most common bronchoscopic finding (85% of patients), and nearly all locations of airway involvement were in the airway below the carina (90% of patients). The tracheal compression was usually caused by aberrant systemic branching arteries in the anatomy-associated group. In the haemodynamics-associated group, the causal relationships varied. Tracheal compression was often caused by lesions of the main pulmonary artery and aorta, whereas obstruction of the right main bronchus was caused by lesions of the main pulmonary artery and right pulmonary artery. The causes of left main bronchus compression were more diverse. In summary, the bronchoscopic presentations and locations are quite different between these two groups.

scholarly journals Unusual Pharyngo-Esophageal Dysphagia Caused by a High-Riding Right Brachiocephalic Artery

2021 ◽  
Vol 45 (1) ◽  
pp. 79-82
Author(s):  
Ki Hoon Park ◽  
Sora Baek ◽  
Eun Kyoung Kang
Keyword(s):  
Filling Defect ◽  
Neck Mass ◽  
Solid Food ◽  
Brachiocephalic Artery ◽  
Food Bolus ◽  
Videofluoroscopic Swallowing Study ◽  
Esophageal Dysphagia ◽  
Left Neck ◽  
The Right ◽  
Cervical Area

High-riding right brachiocephalic and subclavian arteries are often asymptomatic and rare vascular variations. We present a patient with high-riding right brachiocephalic and subclavian arteries that caused compressive pharyngeal and cervical esophageal dysphagia. An 82-year-old woman presented to our hospital with dysphagia that worsened with solid food. A pulsatile lump was observed on the right neck side. A videofluoroscopic swallowing study showed a deviated food bolus movement anterolaterally from the normal vertical pharyngoesophageal transition, with a filling defect in the lower pharynx through the upper esophagus. Neck computed tomography (CT) showed high-riding right brachiocephalic and subclavian arteries and a tortuous right common carotid artery located adjacent to the trachea in the cervical area. The cervical midline structures were deviated to the left neck side. A neck mass with vascular variation should be considered as a cause of dysphagia that worsens with solid food; CT should be considered to determine its cause.

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